Chemainus, Canada offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Chemainus is known for its outdoor mural art gallery. The best time to visit Chemainus, Canada, is during the summer months of June to August, when the average air temperature is around 20°C (68°F) and the water temperature is approximately 15°C (59°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!